Wikidata does not wish to do an official launch so I guess it will be just us. We also need to figure out what sort of site wide notice we wish. I will add it to the press release page. http://en.wikivoyage.org/wiki/User:Jmh649/Press_release
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James Heilman
MD, CCFP-EM, Wikipedian
The Wikipedia Open Textbook of Medicine